Pretty astonishing that they managed to mine more than one orphaned block at a 10min block interval. One single orphan is already pretty rare in the history of Bitcoin but two in a row? No other pool reported orphans right?

I have to look closer into the exact time stamp of the orphaned blocks but if their blocks were coincidentially orphaned after the patch to the exploit was published, they might have not updated their node software in time and caused their blocks to be rejected by the other pools who had already updated themselves as a result.